rsh
CCIE

RSH to Cisco router

23/11/10 16:16

A Cisco router can be managed via telnet, ssh, snmp and... rsh. I’ve never really used RSH so now it’s time to check how it works!

We need to enable rsh on the router, specifying ip address and username of the host sending commands. A local username is also needed, it can be the same as the hostname or different:

R(config)#ip rcmd rsh-enable
R(config)#ip rcmd remote-host ROUTER 10.0.0.100 ifconfig enable



“ROUTER” is the local name
“ifconfig” is the username to be used on the host connecting


Enabling debug on the router shows rsh connections:

R#deb ip tcp rcmd



Now let’s open a terminal window on OSX and send some commands to the router:


iMac:~ ifconfig$ rsh -l ROUTER 10.0.0.254  sh clock

16:32:07.465 ROME Tue Nov 23 2010



This is the output of the debug command:

038709: Nov 23 16:33:38.104 ROME: RCMD: [514 <- 10.0.0.100:951] recv 950\0
038710: Nov 23 16:33:40.309 ROME: RCMD: [514 <- 10.0.0.100:951] recv ifconfig\0ROUTER\0sh clock\0
038711: Nov 23 16:33:40.309 ROME: RCMD: [514 -> 10.0.0.100:951] send



It works!